Testicular enlargement for aesthetic enhancement can be done with one of two implant techniques…side by side and a wraparound concept. The choice between the two depends on the natural size of one’s testicles. With very small testicles (3.5cms or less) displacement by much larger sized implants (the operative words here are much larger) is usually best and has the least risk of complications. With larger testicles the side by side method may not adequately displace or overwhelm the natural testicles and an unnatural appearance of four testicles may result. This is where the wrap around implant concept has its role in testicular enlargement.
The wrap around testicle implant is a preformed implant that has a hollow inner chamber. It is easy to see that the natural testicle fits inside with its attached cord exiting out the opening at the open end of the implant. Unlike a rigid glass bottle where the opening can not possibly allow a larger object to pass through it, a solid silicone implant is flexible. Thus its small opening can be expanded/stretched to allow the testicle to be placed inside it.The elastic deformation property of solid silicone allows the stretched opening to quickly go back down to its original size entrapping the larger testicle inside.
Theoretically once the implant opening snaps back down to its original small size, the testicle should not be able to get back out. But this is not always true. The smooth inner surface of the implant and the natural compressibility of the testicles can make it slide back out. This risk is enhanced when two issues exist, 1) the wall of the implant is fairly thick and 2) there is a mismatch between the size of the inner chamber of the implant and that of the testicle. This second one is the most important. If the natural size of the testicle is slightly bigger than the inner chamber of the implant, that is a recipe for postoperative extrusion. At the time of surgery it may seem secure but the compression of the implant on the testicle and its natural smoothness make for it being able to slip back out.
As a result it is important to match the inner chamber size of the implant to that of the natural size of the testicle. Ideally preoperative ultrasound imaging is the most accurate way to measure the natural size of the testicle. External measurements are highly unreliable but often are what has to be used. Using external measurements one has to be prepared intraoperatively to match the size of the testicle with the size of the inner chamber should the testicle be larger. (or a smaller) In the case of a larger testicle the inner chamber needs to be enlarged by either everting it inside out (or cutting a slit into it) and then trimming it with scissors. The slit is then closed with resorbable sutures.
In the case of a smaller testicle than the inner chamber (which is very uncommon) the entire inner chamber needs tone downsized. This can only be accomplished by splitting the implant in half, removing full thickness wedges of material along the splits and then suturing it back together.
Dr. Barry Eppley